505545123565 has 12 divisors (see below), whose sum is σ = 644438837556. Its totient is φ = 380645739008.

The previous prime is 505545123553. The next prime is 505545123571. The reversal of 505545123565 is 565321545505.

It can be written as a sum of positive squares in 6 ways, for example, as 60790847364 + 444754276201 = 246558^2 + 666899^2 .

It is not a de Polignac number, because 505545123565 - 2⁹ = 505545123053 is a prime.

It is a super-2 number, since 2×505545123565² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174927664 + ... + 174930553.

It is an arithmetic number, because the mean of its divisors is an integer number (53703236463).

Almost surely, 2^505545123565 is an apocalyptic number.

It is an amenable number.

505545123565 is a deficient number, since it is larger than the sum of its proper divisors (138893713991).

505545123565 is a wasteful number, since it uses less digits than its factorization.

505545123565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349858256 (or 349858239 counting only the distinct ones).

The product of its (nonzero) digits is 2250000, while the sum is 46.

The spelling of 505545123565 in words is "five hundred five billion, five hundred forty-five million, one hundred twenty-three thousand, five hundred sixty-five".